The man, who posts as Mike Mazzone on Twitter, had donated $1,000 to Ives' campaign. His Twitter profile features a picture of him giving a Nazi salute.
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In a statement released Sunday, Ives said the staffer didn't realize who the man was when they re-tweeted his post about the contribution.
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The Ives campaign is returning the donation. Ives has previously been criticized for her controversial ads attacking Governor Bruce Rauner's stances on abortion, immigration and transgender rights.